It doesn't. You can teach it Shadow Ball with TM30, or have your Misdreavus level up to level 37 before evolving it.
33 level
It can learn Shadow Ball.
level 45 in fire red leaf green
sorry to burst your bubble, but ariados can't learn shadow ball.
yep
33 level
Actually, it does learn Shadow Ball. It learns it at level 33, or through TM.
It can learn Shadow Ball.
It evolves into Beastyena using a Dusk Stone.
Yes. It learns it at about level 35.
level 45 in fire red leaf green
Swap the Toxic Plate with something that will power up dark or ghost type attacks .Awesome!
I don't think Persian learns it naturally. Only by TM30.
sorry to burst your bubble, but ariados can't learn shadow ball.
yep
Yes it can.
yes it can